But that's the thing about the mortality factor. This guest character isn't actually going to die, because the whole point of that plot thread is that Kirk and Spock do save him. See, even if the main characters lives twenty years hence weren't already on screen, I don't think anybody would really think they had even the slightest chance of dying. Did anybody think that John McClane was gonna die in Die Hard 4? Jack Sparrow? Spider-Man, for heaven's sake? (That's probably the most apt analogy.) Main characters just don't die in most movies, and usually when they do, it's part of the plot. So as far as mortality is concerned, I don't think there's any issue there. As far as character growth, I see what you're saying. But, as I think Cary said, they can still grow in this movie up to the characters they become in the series. After that, we'll just have to wait and see. No use stressing over what they're going to do in the next movie. Let's just enjoy this one, I say. If Nimoy ain't full of crap, it's shaping up to be pretty good.